American Telephone and Telegraph Company. Long Lines Department. Principles of electricity applied to telephone and telegraph work : a training course text / prepared for employees of the Long lines Department, American Telephone and Telegraph Company.

American Telephone and Telegraph Company. Long Lines Department.

Principles of electricity applied to telephone and telegraph work : a training course text / prepared for employees of the Long lines Department, American Telephone and Telegraph Company.

Telephone.

Telegraph.

Electricity.

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